Changed Air Filter and better MPGs? - Diesel Forum - TheDieselStop.com
6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

 3Likes
  • 2 Post By larrgh
  • 1 Post By ArcticDriver
 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 07-16-2019, 06:14 AM Thread Starter
Junior Member
 
Join Date: Mar 2018
Posts: 22
My Photos: (0)
Feedback Score: 0 reviews
Changed Air Filter and better MPGs?

I have a 2015 F350 diesel that I hate the MPG. around town 12mpg, on straight highway 14mpg. and pulling my 15K RV about 8.5mpg.


So, I finally put a $75 K&N air filter in and suddenly it has increased my mileage by 1-2mpg? really????? pulling at 65 mph it was rated at 9.5mpg....ummm. around town--just short time---15mpg??????ummm



I guess we'll see.


My old 2006 chevy diesel always got much better mpgs....oh well, we'll see.


go K&N
mazboy is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 07-16-2019, 08:02 AM
Senior Member
 
Join Date: Aug 2001
Location: Tallassee, AL
Posts: 2,454
My Photos: (0)
Feedback Score: 0 reviews
Not to be disrespectful, but many do not recommend the K&N style filters when the engine has a turbo. The oiled screen tends to allow some silica to pass and then possible damage over time to the turbo vanes.

Does this filter setup still use the Ford stock air box? If so, do you still use the foam pre-filter? If you use the foam pre-filter, you might be ok.
HeavyAssault and ford_doctor like this.

Larry

2015 F350 Ultra Lariat 6.7L CCLB DRW 3.73 Limited Slip, Green Gem Metallic w/ Caribou accent, Camper Package, Titan 65gal tank, Rapid Heat, Block Heater, Upfitter Switches, Dual Alternators, Camper Package, Cable Lock, Husky Floor Liners, Spray in Bedliner, 5th Wheel Prep, 25K 5th Wheel Hitch, Ford Goose Neck Hitch.

Traded 2011 F350 XLT CCLB SRW 6.2L gasser 6,000 miles for 2015

Sold 1996 F350 XLT CCLB DRW 7.3L 208,000 miles



larrgh is offline  
post #3 of 7 (permalink) Old 07-16-2019, 01:08 PM
Senior Member
 
Join Date: Apr 1999
Location: Chugiak Alaska
Posts: 4,526
My Photos: (8)
Feedback Score: 0 reviews
Is this hand calculated or off a readout.
DENNY

Early 1999 F350 AUTO 4x4 CC LB DRW 4.10 6.0 trans cooler, Front hitch, 2,000 hubs/ brakes, Bilstein shocks/steering stabilizer, Diesel site coolant filter 203 thermostat, EBV delete, new O-rings, new Oil cooler, RIFF RAFF FRX, Glow plug led, Pillar gauges, Lighted cupholder, Painless wiring fuze block, Harpoon/hutch mods, Removed axle blocks. Air bags, 5 wheel hitch, In bed 7 pin plug. Spare tire key delete. KLHANSEN on speed dial. 75,000 as of May 2019
DENNY is offline  
Sponsored Links
Advertisement
 
post #4 of 7 (permalink) Old 07-16-2019, 08:25 PM
Lifetime Supporting Member
 
ArcticDriver's Avatar
 
Join Date: Apr 2015
Location: Longmont, CO
Posts: 3,608
My Photos: (0)
Feedback Score: 0 reviews
If the same factory airbox is used then the equation is:
Better filtering = more restrictive.
Less restrictive = poorer filtration.

Individual preference on priority.
HeavyAssault likes this.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 CC SB 7.3 PSD w/4R100. 182,000 miles.
NOS Black CPS. ScanGauge-II, AIC, Bilstein 5100, Stancor GPR, Marinco Mod, B&W Turnover Ball, Michelin Defender LTX


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 SC LB 7.3 PSD w/ZF-6. 177,000 miles.
NOS Black CPS. ScanGauge-II. Bilstein 5100. Noco Mod. Michelin Defender LTX 285/75/16.

SOLD:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2000 F-250 4x4 SC SB 7.3 PSD w/4R100. 164,000 miles.
NOS Black CPS. Rebuilt Fuel bowl w/gold spring, 6.0 Cooler, Walker BTM, Stancor GPR, Michelin LTX M&S2.
ArcticDriver is offline  
post #5 of 7 (permalink) Old 07-17-2019, 05:33 AM Thread Starter
Junior Member
 
Join Date: Mar 2018
Posts: 22
My Photos: (0)
Feedback Score: 0 reviews
update. the k&n filter seems to have increased my pulling to about 10mpg.....about time

as for just driving on highway, still around 14mpg. around town 12+mpg. I only dream of those mpgs people talk about that are around 19-20mpg.....

oh well, I didn't need the $75 I spent on the k&n filter anyway.

this is just the stock air system and I just changed out the filter, it is a non oiled filter.
mazboy is offline  
post #6 of 7 (permalink) Old 07-17-2019, 08:12 AM
Senior Member
 
gearhead1011's Avatar
 
Join Date: May 2005
Posts: 576
My Photos: (10)
Feedback Score: 0 reviews
Personally I don't see how it's possible for an air filter to improve fuel economy on a vehicle like this. Back in the carburetor days when a restricted filter would have a choking effect on an engine, yeah but with an engine that is measuring the volume of air going in then metering the proper amount of fuel, no. If anything a restricted air filter will limit the total volume of air available and should improve economy under wide open acceleration. Some things that will make a difference that may go unnoticed are the quality of fuel, summer or winter blend of fuel, driving habits and conditions. Short trips will kill fuel economy especially on a heavy truck. You can't rely on the DIC for accurate or consistent fuel economy numbers. Mine will vary anywhere from .5 to 1.5 difference in actual hand calculated. Fuel from different stations in the same area will yield different fuel economy. I found my truck gets better MPG from fuel I buy outside of my home state.

2012 F250 XLT
6.7 CCSB 4X4 Sterling Grey, B&W Turnover Goosenech Hitch, Air Lift LoadLifter 5000, 50 gallon Transfer Flow replacement tank, Weather Tech mats

Last edited by gearhead1011; 07-17-2019 at 08:15 AM.
gearhead1011 is offline  
post #7 of 7 (permalink) Old 07-18-2019, 05:31 AM
Lifetime Supporting Member
Lifetime Supporting Member
 
HeavyAssault's Avatar
 
Join Date: Oct 2000
Location: VA
Posts: 4,012
My Photos: (6)
Feedback Score: 0 reviews
The motor is nothing more than a big air pump. The easier the path/flow of air into and out of the motor the better.

Go buy a really thick milkshake. Use one of those cocktail straws to try to drink the milkshake. Then go get those huge MC'D straws......

The flow thru the filter into the turbo is better with the K&N but the filter brand has had bad past history when used with turbos.

Quote:
yeah but with an engine that is measuring the volume of air going in then metering the proper amount of fuel, no. If anything a restricted air filter will limit the total volume of air available and should improve economy under wide open acceleration.
Hence you would have ****ty performance to boot....not what people want at WOT right?

Since I have tracked my MPGs for over 135k now I can say there's a significant difference in the dash display, as well as the odometer showing miles driven. In the end the numbers don't lie. Even with some of the factors I listed the MPGs are only about .5MPG off from my hand calculations and using my standalone GPS miles driven.

The odometer seems to be 1-3% off on the miles when compared to GPS miles driven. That 1% number gives better results cause I'm running a size over stock tires. So when running factory tires it's in the 3% difference area for miles driven when comparing the dash odometer and standalone GPS.

2015 F-350 CCLB PSD 4X4 3.55 ELD

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Some stock stuff, some modded stuff, some deleted stuff.....
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
HeavyAssault is offline  
Sponsored Links
Advertisement
 
Reply

  Diesel Forum - TheDieselStop.com > 2011 - 2016 Ford Super Duties > 6.7L Power Stroke Engine and Drivetrain

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Forum - TheDieselStop.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome